Butler Did It! by Keith Pomeroy (The Matthew Butler Adventures)

When Katherine Annenberg, a beautiful South African photographer scuba diving in the Seychelles, saves a drowning man, she discovers that someone is trying to kill both of them. A chance rescue by Matthew Butler and his sidekick Tommy Cooper, suddenly thrusts them, along with their zany crew on the converted LST, the Pelican, into conflict with a murderous band of gunrunners who are attempting to foment a revolution by the theft of an ancient treasure. Using everything from Leonardo’s Parachute to an orange juice cannon, unlikely hero Matthew Butler and his crew battle the mysterious death merchant, Alexander Levasseur, in the hope of recovering the treasure and preventing a civil war.